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#[cfg(feature = "alloc")]
use alloc::vec::Vec;
use core::{fmt::Debug, ops::Range};
use crate::error::Error;
mod array;
pub use self::array::ArrayKey;
mod hash;
pub use self::hash::HashBuffer;
#[cfg(feature = "alloc")]
mod secret;
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub use self::secret::SecretBytes;
mod string;
pub use self::string::HexRepr;
mod writer;
pub use self::writer::Writer;
pub trait WriteBuffer: Debug {
fn buffer_write(&mut self, data: &[u8]) -> Result<(), Error>;
}
pub trait ResizeBuffer: WriteBuffer + AsRef<[u8]> + AsMut<[u8]> {
fn buffer_insert(&mut self, pos: usize, data: &[u8]) -> Result<(), Error>;
fn buffer_remove(&mut self, range: Range<usize>) -> Result<(), Error>;
fn buffer_resize(&mut self, len: usize) -> Result<(), Error>;
fn buffer_extend(&mut self, len: usize) -> Result<&mut [u8], Error> {
let pos = self.as_ref().len();
let end = pos + len;
self.buffer_resize(end)?;
Ok(&mut self.as_mut()[pos..end])
}
}
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl WriteBuffer for Vec<u8> {
fn buffer_write(&mut self, data: &[u8]) -> Result<(), Error> {
self.extend_from_slice(data);
Ok(())
}
}
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl ResizeBuffer for Vec<u8> {
fn buffer_insert(&mut self, pos: usize, data: &[u8]) -> Result<(), Error> {
self.splice(pos..pos, data.into_iter().cloned());
Ok(())
}
fn buffer_remove(&mut self, range: Range<usize>) -> Result<(), Error> {
self.drain(range);
Ok(())
}
fn buffer_resize(&mut self, len: usize) -> Result<(), Error> {
self.resize(len, 0u8);
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
pub(crate) fn test_write_buffer<B: WriteBuffer + AsRef<[u8]>>(mut w: B) {
w.buffer_write(b"he").unwrap();
w.buffer_write(b"y").unwrap();
assert_eq!(&w.as_ref()[..], b"hey");
}
pub(crate) fn test_resize_buffer<B: ResizeBuffer>(mut w: B) {
w.buffer_write(b"hello").unwrap();
w.buffer_insert(1, b"world").unwrap();
assert_eq!(&w.as_ref()[..], b"hworldello");
w.buffer_resize(12).unwrap();
assert_eq!(&w.as_ref()[..], b"hworldello\0\0");
w.buffer_resize(6).unwrap();
assert_eq!(&w.as_ref()[..], b"hworld");
w.buffer_insert(1, b"ello").unwrap();
assert_eq!(&w.as_ref()[..], b"helloworld");
}
#[test]
fn write_buffer_vec() {
test_write_buffer(Vec::new());
}
#[test]
fn resize_buffer_vec() {
test_resize_buffer(Vec::new());
}
}